The instrument, used for recording tremors of earth, is known as _____.

1. 1. Crescograph
   2. Lactometer
   3. Seismograph
   4. Hydrometer

Which of the following is a gas?

1. 1. Thorium
   2. Chlorine
   3. Mercury
   4. Plutonium

The energy stored in a stretched spring is _____.

1. 1. Heat energy
   2. kinetic energy
   3. Elastic potential energy
   4. Potential energy

A moving ball stops due to the action of _____.

1. 1. Frictional Force
   2. Electric Force
   3. Nuclear Force
   4. Magnetic Force

Energy of a body due to its motion is called _____.

1. 1. Light energy
   2. Potential energy
   3. Kinetic energy
   4. Heat energy

Two parallel wires carrying currents in the same direction attract each other because of

1. 1. Electric forces between them
   2. Potential difference between them
   3. Magnetic force between them
   4. Mutual inductance between them

An electric motor is used to convert _____.

1. 1. Mechanical energy into kinetic
   2. Electrical energy into mechanical energy
   3. Higher voltage to lower voltage
   4. Mechanical energy into electrical

When the door of an operating refrigerator is opened the temperature of the room will _____.

1. 1. Fall down immediately
   2. Increase
   3. Decrease
   4. Remain unchanged

On earth a moving body ordinarily comes to rest by itself because of the _____.

1. 1. Gravity
   2. Law of inertia
   3. Forces of friction
   4. Conservation of momentum

Air is completely removed from an electric bulb to prevent _____.

1. 1. Bursting of the bulb
   2. Loss of light due to absorption
   3. Oxidation of tungsten filament
   4. None of them